If you can see it running down the inside, chances are that your bulkhead is filled with water. Open bonnet and have a look at the rear compartment below the windscreen. The drain holes block up with leaves, and the water will overflow into the car.
Pollen filter housing seal as mentioned is another possibility.
Another leak point is through the inner door membrane. Make sure the drain holes at the bottom of the doors are unblocked. You will have to remove the inner door panels to check the actual membranes.
Many VAG cars are known for water leaks.
Edited by corax on 04/03/2015 at 07:42
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